True nothing? One final all-encompassing element or molecule? Same as before the big bang?
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Depends on how you define the universe. For example, where does the earth end? Does it end at the ground below your feet? Or are you still “on earth” until you’ve left the upper atmosphere, meaning the gasses that make up the atmosphere are considered part of the planet earth too. If you then look at the universe in the same way, where does it end? Does it end where the vast expanse of space that all matter once contained in the big bang is expanding into potentially ends, or does the universe end at the furthest point matter from the big bang has reached, and the empty void beyond that is what would be considered “outside of the universe”.
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